avoid float -> int64 conversion #1977

both cases have to be relatively small durations of time cherry picking...

firmware/controllers/engine_cycle/rpm_calculator.cpp

@@ -386,7 +386,8 @@ efitick_t scheduleByAngle(scheduling_s *timer, efitick_t edgeTimestamp, angle_t
 		action_s action DECLARE_ENGINE_PARAMETER_SUFFIX) {
 	float delayUs = ENGINE(rpmCalculator.oneDegreeUs) * angle;
 
-	efitime_t delayNt = US2NT(delayUs);
+    // 'delayNt' is below 10 seconds here so we use 32 bit type for performance reasons
+	int32_t delayNt = USF2NT(delayUs);
 	efitime_t delayedTime = edgeTimestamp + delayNt;
 
 	ENGINE(executor.scheduleByTimestampNt(timer, delayedTime, action));

firmware/controllers/system/timer/pwm_generator_logic.cpp

@@ -136,8 +136,9 @@ void PwmConfig::setFrequency(float frequency) {
 	}
 	/**
 	 * see #handleCycleStart()
+	 * 'periodNt' is below 10 seconds here so we use 32 bit type for performance reasons
 	 */
-	periodNt = US2NT(frequency2periodUs(frequency));
+	periodNt = USF2NT(frequency2periodUs(frequency));
 }
 
 void PwmConfig::stop() {